This collection of test sites provides critical information on the post launch characterization and calibration of space-based optical imaging sensors to assist the global science community in providing more accurate land/climate studies. (1972 to present)

The first of a series of NASA Applications Explorer Missions (AEM-A) that collected visible and thermal band data of the earth from April, 1978 through September, 1980. A HCMM scene has a width of approximately 715 km with a moderate resolution of 500-600 meters. (1978 - 1980)